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