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