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