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