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