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