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