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