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