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