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