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