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