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