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