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