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