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