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