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