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