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