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