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