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