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