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