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