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