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