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