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