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