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