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