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