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