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