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