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