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