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