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