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