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