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