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