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