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