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