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