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