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