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