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