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