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