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)(15,21)(16,22)(17,19)(18,20)(23,26)(24,27)(25,28)(5,6)(7,10)(8,11)(9,12)(14,19)(15,23)(20,22)(24,25) involution — undirected(5,7,9,8)(6,10,12,11)(14,20)(16,18)(19,22)(21,27)(24,25)(26,28)(5,7,9,8)(6,11,12,10)(13,15,17,23)(14,21,19,26)(16,25,18,24)(20,27,22,28)(1,3,4,2)(5,8,9,7)(6,11,12,10)(13,16,17,18)(14,20,19,22)(15,24,23,25)(21,28,26,27)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.