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