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