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