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)(15,20,24,28)(16,25,23,21)(17,22,27,26)(5,7,10,6)(8,12,9,11)(13,15)(14,20)(16,22)(17,21)(18,24)(19,28)(23,26)(25,27)(2,4)(13,16,18,23)(14,21,19,25)(15,17,24,27)(20,26,28,22)(5,8,10,9)(6,11,7,12)(13,14,18,19)(15,20,24,28)(16,21,23,25)(17,26,27,22)(5,9,10,8)(6,11,7,12)(13,17)(14,22)(15,23)(16,24)(18,27)(19,26)(20,21)(25,28)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.