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