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