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