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