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