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