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