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