Line 13x9 inch pan with some of the graham crackers, breaking them if necessary. Pour cold milk into a bowl. Add pudding mix. With electric blender on low, beat until well blended, about 2 minutes. Let stand for 5 minutes, and then blend in Cool Whip.
Spread half of the pudding mixture over graham crackers. Add another layer of graham crackers. Top with remaining pudding mixture and remaining graham crackers. Spread cherry pie filling over the graham crackers.