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)(15,22)(16,18)(17,27)(19,21)(20,25)(23,24)(26,28)(1,2,4,3)(5,7)(6,9)(8,11)(10,12)(13,15,18,25)(14,20,16,22)(17,26,19,24)(21,28,27,23)(6,10)(7,11)(13,14,18,16)(15,22,25,20)(17,27,19,21)(23,26,28,24)(6,10)(9,12)(13,16,18,14)(15,23,25,28)(17,27,19,21)(20,24,22,26)(1,3,4,2)(13,17,18,19)(14,21,16,27)(15,24,25,26)(20,23,22,28)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.