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