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