One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,5)(4,6)(7,8)(9,10)(11,15)(12,14)(13,16)(17,18,21,23)(19,24,27,20)(22,25,31,29)(26,28,32,30)(1,3,4,7)(2,5,6,8)(9,11)(10,13)(12,16)(14,15)(18,23)(19,26)(20,28)(22,31)(24,30)(27,32)(2,6)(5,8)(11,16)(13,15)(17,19,22,26,21,27,31,32)(18,24,25,28,23,20,29,30)(10,14)(13,15)(18,23)(20,24)(25,29)(28,30) involution — undirected(17,20,22,30,21,24,31,28)(18,19,25,26,23,27,29,32)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.