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