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