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)(11,15)(12,14)(13,16)(17,18)(19,22)(20,31)(21,28)(23,27)(24,29)(25,30)(26,32) involution — undirected(9,11)(10,13)(12,16)(14,15)(17,19,23,29)(18,24,27,22)(20,32,30,21)(25,26,31,28)(2,5)(6,8)(11,16)(13,15)(17,20,21,19,23,30,32,29)(18,25,28,24,27,31,26,22)(1,3,4,7)(2,6,5,8)(10,14)(13,15)(17,21,23,32)(18,26,27,28)(19,20,29,30)(22,25,24,31)(17,22,21,25,23,24,32,31)(18,19,28,30,27,29,26,20)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.