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