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