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