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