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