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