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