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