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