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