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