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