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