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