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