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