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