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)(14,18)(15,22)(19,21)(23,28)(5,6)(7,10)(8,12)(9,11)(13,14,16,18)(15,20,22,25)(17,19,24,21)(23,26,28,27)(1,2,3,4)(14,19)(15,22)(17,24)(18,21)(20,27)(25,26)(5,7,9,8)(6,10,11,12)(13,15,16,22)(14,20,18,25)(17,23,24,28)(19,26,21,27)(5,8,9,7)(6,10,11,12)(14,19)(17,24)(18,21)(20,26)(23,28)(25,27)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.