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