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