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