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