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