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