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