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)(11,15)(12,13)(14,16)(19,28)(21,30)(24,32)(26,29) involution — undirected(10,13)(11,16)(17,18,22,27)(19,29,28,26)(20,25,23,31)(21,24,30,32)(2,5)(6,8)(9,11,12,16)(10,14,13,15)(17,19,22,28)(18,24,27,32)(20,21,23,30)(25,26,31,29)(1,3,4,7)(2,6,5,8)(10,13)(14,15)(17,20,22,23)(18,25,27,31)(19,30,28,21)(24,29,32,26)(17,21,22,30)(18,26,27,29)(19,20,28,23)(24,25,32,31)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.