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