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