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