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