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