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