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