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