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