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