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