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