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