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)(19,26)(23,27)(28,29)(31,32)(2,6)(7,8)(17,18)(19,27)(20,22)(21,25)(23,26)(24,30)(28,32)(29,31) involution — undirected(1,3,5,4)(2,7,6,8)(10,13)(14,16)(18,22)(19,28)(20,30)(24,25)(26,29)(31,32)(1,3,5,4)(2,7,6,8)(9,11,12,15)(10,14,13,16)(17,19)(18,23)(20,28)(21,26)(22,31)(24,32)(25,27)(29,30)(1,4,5,3)(2,8,6,7)(18,24)(19,28)(20,30)(22,25)(23,27)(26,29)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.