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