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