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