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