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