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)(15,19,20,18)(22,26)(23,27)(6,10)(8,12)(13,14)(15,19)(16,17)(18,20)(21,22,25,26)(23,24,27,28)(6,10)(7,11)(14,17)(18,19)(22,26)(23,27) involution — undirected(1,2)(3,4)(5,7)(6,8)(9,11)(10,12)(13,14)(15,18)(16,17)(19,20)(21,23)(22,24)(25,27)(26,28) involution — undirected(5,8)(6,7)(9,12)(10,11)(13,15,16,20)(14,18,17,19)(21,24)(22,23)(25,28)(26,27)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.