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