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