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