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