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