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)(15,21)(16,22)(17,23)(18,20)(19,24)(25,27)(26,28) involution — undirected(5,6)(7,11)(8,10)(9,12)(14,20)(15,25)(16,21)(17,18)(23,24)(27,28) involution — undirected(2,4)(5,7,8,12)(6,9,10,11)(13,15)(14,21)(16,23)(17,22)(18,26)(19,25)(20,28)(24,27)(7,12)(9,11)(13,16)(14,22)(15,20)(17,27)(18,21)(19,28)(23,25)(24,26) involution — undirected(6,10)(9,11)(13,17,19,18)(14,20,24,23)(15,26,25,22)(16,27,28,21)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.