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