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