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