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