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