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