One vertex per element, one color per generator, with an edge from x to x·s.
(3,7)(5,8)(11,15)(13,16)(17,18)(19,26)(20,21)(22,23)(24,27)(25,30)(28,29)(31,32) involution — undirected(1,2)(3,8)(4,6)(5,7)(9,10,12,14)(11,13,15,16)(18,23)(19,27)(20,30)(29,31)(1,3,4,7)(2,5,6,8)(9,11)(10,13)(12,15)(14,16)(18,23)(20,30)(24,26)(28,32)(2,6)(5,8)(9,10)(11,13)(12,14)(15,16)(17,19,22,27)(18,24,23,26)(20,28,30,32)(21,31,25,29)(1,3)(2,5)(4,7)(6,8)(9,11)(10,13)(12,15)(14,16)(17,20)(18,25)(19,28)(21,23)(22,30)(24,29)(26,31)(27,32) involution — undirected(1,2)(3,5)(4,6)(7,8)(17,21,22,25)(18,20,23,30)(19,29,27,31)(24,32,26,28)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.