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