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