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