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