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