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