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