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