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