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