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