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