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