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