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