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