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