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