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