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