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