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