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