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