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