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