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