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