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