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