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