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