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