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