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