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