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