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