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