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