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