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