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