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