The Vanquish S doesn't have a bodykit.
The exterior changes are quite subtle; a splitter at the front to improve aerodynamic stability, a more rounded and open grille for better cooling and a redesigned boot lid to give better downforce. The drag co-efficient has thus been improved slightly from 0.33 to 0.32.
Also, the Vanquish S interior has some differences from the original car. The central etched glass and backlit starter button is straight from the DB9. The centre console is now covered in leather instead of being painted.