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