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