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