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