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