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