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