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