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)(11,15)(17,18)(19,23)(20,24)(21,22)(27,31)(28,32) involution — undirected(2,3)(4,8)(10,13)(14,16)(18,21)(19,20)(25,26,29,30)(27,32,31,28)(4,8)(6,7)(9,10)(11,14)(12,13)(15,16)(17,19,22,20)(18,23,21,24)(25,27)(26,28)(29,31)(30,32)(1,3,5,2)(4,6,8,7)(9,10)(11,14)(12,13)(15,16)(17,20,22,19)(18,24,21,23)(25,26)(27,28)(29,30)(31,32)(1,4,5,8)(2,6,3,7)(9,11)(10,14)(12,15)(13,16)(17,21,22,18)(19,23,20,24)(25,28)(26,27)(29,32)(30,31)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.