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)(14,19)(15,23)(16,17)(21,22)(24,25)(26,27)(1,3,4,2)(6,10)(7,8)(11,12)(13,14,18,22)(15,20,24,28)(16,21,17,19)(23,27,25,26)(6,11)(7,8)(10,12)(13,15)(14,20)(16,23)(17,25)(18,24)(19,26)(21,27)(22,28) involution — undirected(13,16,18,17)(14,21,22,19)(15,23,24,25)(20,27,28,26)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.