One vertex per element, one color per generator, with an edge from x to x·s.
(2,4)(13,14,19,22)(15,23,25,24)(16,17,21,18)(20,26,28,27)(1,2,3,4)(5,6)(7,10)(8,9)(11,12)(13,15,17,27,19,25,18,26)(14,20,16,23,22,28,21,24)(6,9)(7,11)(13,16,18,14,19,21,17,22)(15,24,26,28,25,23,27,20)(5,7,8,11)(6,10,9,12)(15,25)(20,28)(23,24)(26,27)(6,9)(10,12)(13,17,19,18)(14,21,22,16)(15,26,25,27)(20,23,28,24)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.