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)(15,19)(16,24)(17,22)(18,21)(20,26)(23,25)(27,28)(1,2)(3,4)(5,7,9,8)(6,10,12,11)(13,15)(14,18)(16,20)(17,21)(19,22)(23,26)(24,27)(25,28)(13,16,17,25)(14,20,22,28)(15,23,21,24)(18,27,19,26)(2,4)(5,7,9,8)(6,11,12,10)(14,21)(15,22)(18,19)(20,24)(23,28)(26,27)(5,8,9,7)(6,11,12,10)(14,22)(15,21)(16,25)(26,27)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.