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