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