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