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