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