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