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