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