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