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