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