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