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