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