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