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