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