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)(25,31)(26,28)(27,32) involution — undirected(2,5)(6,8)(17,18,24,32,19,28,30,25,20,23,21,27,22,26,29,31)(1,3)(2,6)(4,7)(5,8)(10,13)(14,16)(18,25)(19,22)(21,30)(23,31)(24,29)(26,27)(28,32) involution — undirected(3,7)(6,8)(9,11,12,15)(10,14,13,16)(17,19,20,22)(18,26,23,28)(21,29,24,30)(25,32,31,27)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.