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