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)(11,13)(12,14)(15,16)(17,18)(19,28)(20,27)(21,25)(22,26)(23,30)(24,29)(31,32) involution — undirected(1,3,4,8)(2,5,6,7)(9,11)(10,13)(12,15)(14,16)(17,19)(18,23)(20,31)(21,30)(22,29)(24,27)(25,28)(26,32)(11,15)(13,16)(17,19)(18,24)(20,29)(21,30)(22,31)(23,27)(25,32)(26,28) involution — undirected(2,6)(3,8)(11,15)(13,16)(18,25)(23,28)(24,32)(26,27) involution — undirected(2,6)(5,7)(10,14)(13,16)(17,20,21,22)(18,26,25,27)(19,29,30,31)(23,24,28,32)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.