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