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