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