Cook pasta according to package directions. Stack pepperoni; cut crosswise in half and lengthwise into ¼-inch slices forming strips.
Combine tomatoes, olives, olive oil and garlic in a very large bowl.
Drain pasta; add to bowl and toss well. Add cheese and basil; toss again. Serve warm or at room temperature. Garnish with additional chopped basil or basil sprigs if desired.