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