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