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