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