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