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)(14,19)(15,23)(16,17)(20,28)(21,22)(24,27)(2,3)(5,7)(6,9)(8,11)(10,12)(13,14,17,19,18,22,16,21)(15,24,25,28,23,20,26,27)(1,2,4,3)(13,15)(14,20)(16,26)(17,25)(18,23)(19,27)(21,28)(22,24)(1,3,4,2)(7,11)(9,12)(13,16,18,17)(14,21,22,19)(15,25,23,26)(20,27,24,28)(13,14,16,21,18,22,17,19)(15,20,26,28,23,24,25,27)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.