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