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