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