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