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