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