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