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