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