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