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