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