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