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