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)(17,18,24,23)(19,25,31,32)(20,22,27,29)(21,30,28,26)(2,5)(6,8)(17,19,24,31)(18,25,23,32)(20,30,27,26)(21,22,28,29)(9,11,12,16)(10,13,14,15)(17,20)(18,22)(19,28)(21,31)(23,29)(24,27)(25,26)(30,32)(1,3,4,7)(2,6,5,8)(17,21)(18,26)(19,29)(20,32)(22,31)(23,30)(24,28)(25,27)(17,22,24,29)(18,27,23,20)(19,30,31,26)(21,25,28,32)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.