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