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