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