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