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)(13,14,19,22)(15,24,23,18)(16,26,25,20)(17,21,27,28)(5,6)(7,11)(8,10)(9,12)(13,15,18,14,19,23,24,22)(16,27,21,26,25,17,28,20)(2,4)(5,7)(6,9)(8,12)(10,11)(13,16,19,25)(14,20,22,26)(15,17,23,27)(18,21,24,28)(7,12)(9,11)(13,17,19,27)(14,21,22,28)(15,25,23,16)(18,26,24,20)(6,10)(9,11)(14,22)(15,23)(16,25)(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.