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