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