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