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