Slice the strawberries and pat them dry. Set a few slices aside for topping.
Whisk the strawberry gelatin with the boiling water in a bowl until fully dissolved, about 2 minutes.
Stir in the cold water to cool the mixture to room temperature.
Fold in the thawed whipped topping until the filling looks smooth and fluffy.
Gently fold in most of the sliced strawberries, keeping the reserved slices for garnish.
Pour the filling into the graham crust and smooth the top. Garnish with the remaining berries.
Refrigerate until firm, at least 4 hours, before slicing and serving.