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