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