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