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