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