Combine first 5 ingredients in a large bowl; stir well. Add tomato and onion. Set aside.
Cook pasta according to package directions; drain and add to tomato mixture. Toss well; cover and set aside.
Arrange zucchini and squash slices on a baking sheet coated with cooking spray. Coat vegetables with cooking spray. Broil 3 inches from heat (with electric oven door partially opened) 10 minutes on each side or until golden.
Cut zucchini and squash into 1-inch pieces. Add zucchini, squash, cheese, basil, and olives to pasta mixture; toss well. Cover and chill thoroughly.