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