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