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