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