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