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