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