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