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