Don't add the pasta to the water until the water is at a full boil. Don't overcook the pasta, but just cook to al dente. Rinse the pasta with cold water after cooking since you won't be serving it right away. Also, because you're adding an oil-based dressing to the pasta, you can toss the cold pasta noodles with just a teaspoon or two of extra virgin olive oil to prevent them from sticking. Don't do this if you are serving with tomato sauce or the sauce won't stick.