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