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