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