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