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