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