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