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