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