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