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