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