Revised 27-Apr-20. The EE-404 app note is no longer available, but the same information is now available in a different document. This note was updated to reflect that, as well as Clockworks offers standard cables.
ADI's document ‘A 2 B System Specification Rev 1.2 ’ ( https://www.analog.com/media/en/secure/a2b/A2B-System-Specification-Rev1.2.pdf ) describes the cable characteristics as well as some connectors that have been used for A 2 B  in automotive applications. However it does not provide cable part numbers, and if you dig deeper the recommended cables are automotive ones and not available for purchase by mere mortals.
Clockworks has used Belden 1353A and it seems to work fine in this application. ADI's document calls for +/- 10% impedance variation (100 ohm nominal) and this cable is +/-15%. 100 MHz. Insertion loss for the cable at 100 MHz is specified at 0.26 dB/m versus 0.3 dB/m in ADI's document, and cable return loss at 100 MHz of 20 dB compares well with the 18 dB (and similar at other frequencies).
While it wasn't stated in the original ADI documents, there are now references to CAT5 UTP compliant cable as being the type of cable to use, and the Belden 1353A is compliant.
Clockworks A 2 B module uses the same Molex DuraClik connector system that is used on the Analog Devices EVM boards. As is typical with this type of crimped pin connector, the special tool to make crimps is not cheap. However standard microterminal crimpers can be used for the wire crimp - but use a high quality ones. We like the Engineer brand from Japan, the PA-09 being the best for this particular application.
Crimping the strain relief is little more problematic for a generic hand tool. The Molex pin should have tabs wrap the cable insulation, not pierce it. A conventional crimp tool might do the latter. If you don't overcrimp it with the standard tool it will be fine. Clockworks uses a jewelry crimper for the second (insulation) crimp to avoid piercing the insulation when making cables by hand. However for correctness the actual Molex crimper would be the best tool for any sort of critical application (though the Duraclik might not be appropriate in that case).
Clockworks also offers standard cables for sale, these are mode by a cable house with experience in a range of cable assembly procedures.