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