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