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