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