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