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