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