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