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