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