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