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