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)(11,14)(12,16)(13,15)(17,18,22,25)(19,23,29,28)(20,21,24,31)(26,27,32,30)(2,5)(3,7)(9,11,13,12)(10,14,15,16)(17,19)(18,23)(20,30)(21,26)(22,29)(24,27)(25,28)(31,32)(9,12,13,11)(10,14,15,16)(17,20,25,31,22,24,18,21)(19,26,23,27,29,32,28,30)(2,5)(6,8)(20,24)(21,31)(26,32)(27,30) involution — undirected(1,3,4,7)(2,6,5,8)(17,21,18,24,22,31,25,20)(19,27,28,26,29,30,23,32)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.