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