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