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