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