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