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