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