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