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