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