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