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