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