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