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