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