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