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