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