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