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