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