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