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