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