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