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