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