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