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