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