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