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