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