One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(9,10,12,14)(11,15,16,13)(17,18,22,26)(19,20,25,24)(21,27,29,31)(23,28,30,32)(9,11,12,16)(10,13,14,15)(17,19)(18,24)(20,26)(21,23)(22,25)(27,32)(28,31)(29,30)(2,5)(6,8)(11,16)(13,15)(17,20,30,27,22,24,23,31)(18,25,32,29,26,19,28,21)(1,3,4,7)(2,6,5,8)(10,14)(13,15)(18,26)(20,24)(27,31)(28,32)(17,21,23,19,22,29,30,25)(18,27,28,20,26,31,32,24)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.