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