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