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