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