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