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