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