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