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