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