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