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