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)(18,23)(20,21)(24,26)(25,30)(27,29)(31,32) involution — undirected(2,5)(3,7)(10,13)(11,15)(18,24)(23,26)(25,31)(30,32) involution — undirected(9,10,12,13)(11,14,15,16)(17,18,20,26,22,24,21,23)(19,25,29,32,28,31,27,30)(1,3,4,7)(2,6,5,8)(10,13)(14,16)(17,19)(18,25)(20,29)(21,27)(22,28)(23,30)(24,31)(26,32)(9,11,12,15)(10,14,13,16)(17,20,22,21)(18,26,24,23)(19,27,28,29)(25,30,31,32)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.