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