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)(19,26,29,24)(20,23,30,21)(27,31,32,28)(1,3,4,8)(2,5,6,7)(9,10)(11,15)(12,14)(13,16)(17,19,22,29)(18,24,25,26)(20,27,30,32)(21,31,23,28)(9,11)(10,13)(12,16)(14,15)(17,20,23,25,22,30,21,18)(19,27,28,26,29,32,31,24)(11,16)(13,15)(17,21,22,23)(18,20,25,30)(19,28,29,31)(24,32,26,27)(10,14)(13,15) 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.