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