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