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