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