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