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