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