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