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