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)(13,14,19,21,18,22,16,26)(15,23,25,17,24,20,27,28)(5,7,10,6)(8,11,9,12)(13,15,18,24)(14,20,22,23)(16,27,19,25)(17,21,28,26)(1,2,3,4)(15,24)(17,28)(20,23)(25,27)(5,8,10,9)(6,11,7,12)(13,16,18,19)(14,21,22,26)(15,25,24,27)(17,23,28,20)(5,9,10,8)(6,11,7,12)(13,17,16,23,18,28,19,20)(14,15,26,27,22,24,21,25)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.