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