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)(11,14)(12,15)(13,16)(18,20)(19,23)(25,26,28,30)(27,31,32,29)(2,6)(4,7)(9,11)(10,13)(12,16)(14,15) involution — undirected(2,6)(3,8)(9,11,12,16)(10,14,15,13)(17,18,21,20)(19,22,23,24)(25,26)(27,29)(28,30)(31,32)(1,3)(2,7)(4,6)(5,8)(9,11)(10,14)(12,16)(13,15)(17,19)(18,22)(20,24)(21,23) involution — undirected(1,4,5,7)(2,3,6,8)(9,10)(11,14)(12,15)(13,16)(17,20,21,18)(19,24,23,22)(25,27,28,32)(26,29,30,31)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.