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