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