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