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