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