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