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