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