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