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