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