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