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