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