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