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