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