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