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