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)(15,18)(16,26)(17,25)(19,23)(20,24)(21,27)(22,28)(1,2)(3,4)(6,10)(11,12)(13,15,20,23)(14,18,24,19)(16,22,17,21)(25,27,26,28)(5,7,9,8)(6,11,10,12)(13,16,19,28,20,17,18,27)(14,21,15,25,24,22,23,26)(2,4)(5,7,9,8)(6,11,10,12)(13,17,19,27,20,16,18,28)(14,22,15,26,24,21,23,25)(5,8,9,7)(6,11,10,12)(13,18,20,19)(14,15,24,23)(16,27,17,28)(21,25,22,26)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.