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