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)(14,19)(15,21)(17,25)(24,27)(1,2,4,3)(6,10)(7,11)(13,14,18,19)(15,16,21,20)(17,22,25,26)(23,24,28,27)(5,7,9,11)(6,8,10,12)(13,15)(14,20)(16,19)(17,23)(18,21)(22,27)(24,26)(25,28)(5,8)(6,11)(7,10)(9,12)(13,15)(14,16)(17,23)(18,21)(19,20)(22,24)(25,28)(26,27) involution — undirected(1,3,4,2)(13,16)(14,21)(15,19)(17,24)(18,20)(22,28)(23,26)(25,27)(13,17,18,25)(14,22,19,26)(15,23,21,28)(16,24,20,27)A 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.