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