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