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