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