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