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