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