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