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