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