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