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