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