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