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