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