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