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