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