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