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