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