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