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