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