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