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