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