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