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)(11,13)(12,14)(15,16)(17,18,21,25)(19,26,27,23)(20,22,29,24)(28,31,32,30)(9,11)(10,13)(12,15)(14,16)(18,22)(20,29)(23,30)(24,25)(26,31)(28,32) involution — undirected(1,3,4,8)(2,5,6,7)(11,15)(13,16)(17,19)(18,23)(20,28)(21,27)(22,30)(24,31)(25,26)(29,32)(11,15)(13,16) involution — undirected(10,14)(13,16)(19,27)(23,26)(28,32)(30,31) 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.