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