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