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