One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(10,13)(11,14)(15,16)(17,18,21,25,22,20,26,24)(19,23,28,31,29,30,27,32)(2,5)(3,7)(9,10,12,13)(11,14,15,16)(17,19,26,27,22,29,21,28)(18,23,24,32,20,30,25,31)(1,3,4,7)(2,6,5,8)(9,11,12,15)(10,14,13,16)(17,20)(18,22)(19,23)(21,24)(25,26)(27,32)(28,31)(29,30)(2,5)(6,8)(9,10,12,13)(11,14,15,16)(17,21,22,26)(18,24,20,25)(19,27,29,28)(23,31,30,32)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.