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