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