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