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