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