He was also a varsity player of the University of Santo Tomas swimming team from 1946 to 1953. After his competitive stint as a swimmer he became a referee. As a referee he officiated at the 1981 Southeast Asian Games and in national-level competitions such as the Palarong Pambansa, Philippine National Games, and Batang Pinoy. Cayco was named into the Philippine Sports Hall of Fame on January 25, 2016. He died on 17 February 2021 at the age of 96.