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