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