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