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