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