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