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