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