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