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