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