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