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