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