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