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