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