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