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