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