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