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