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