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