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