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