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