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