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