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