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