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