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