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