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