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