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