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