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