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