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