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