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