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