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