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