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