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