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