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