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