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