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