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