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