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