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