One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,5)(6,8)(9,10)(11,12)(13,14)(15,16)(18,19)(20,24)(27,31)(29,32) involution — undirected(2,5)(3,8)(10,14)(12,15)(18,19)(22,23)(25,26,28,30)(27,29,31,32)(3,8)(6,7)(10,14)(12,15)(17,18,21,19)(20,22,24,23)(25,27)(26,29)(28,31)(30,32)(1,2)(3,7)(4,5)(6,8)(9,11,13,16)(10,15,14,12)(17,19,21,18)(20,23,24,22)(25,26)(27,29)(28,30)(31,32)(1,3,4,8)(2,6,5,7)(9,12,13,15)(10,11,14,16)(17,20,21,24)(18,22,19,23)(25,27)(26,29)(28,31)(30,32)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.