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