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