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