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