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