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