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