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