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