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