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