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