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