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