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