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