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