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