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