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