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