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