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