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