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