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