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