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