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)(11,15)(12,13)(14,16)(17,18,24,21,22,27,23,28)(19,29,31,20,26,25,32,30)(1,3,4,8)(2,5,6,7)(10,13)(14,15)(17,19,22,26)(18,25,27,29)(20,21,30,28)(23,32,24,31)(9,11,12,16)(10,14,13,15)(17,20)(18,26)(19,27)(21,32)(22,30)(23,29)(24,25)(28,31)(2,6)(5,7)(10,13)(14,15)(17,21,24,27,22,28,23,18)(19,30,31,29,26,20,32,25)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.