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