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