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