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