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