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