One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,8)(5,6)(17,18)(19,26)(20,25)(21,23)(22,30)(24,29)(27,31)(28,32) involution — undirected(2,6)(7,8)(9,10,12,13)(11,14,15,16)(18,23)(24,31)(25,30)(26,32)(1,3,5,4)(2,7,6,8)(10,13)(11,15)(17,19,21,28)(18,24,23,31)(20,29,22,27)(25,32,30,26)(1,4,5,3)(2,8,6,7)(9,11)(10,14)(12,15)(13,16)(10,13)(11,15)(17,20,21,22)(18,25,23,30)(19,27,28,29)(24,26,31,32)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.