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