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