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